tree 475844d92c01fae639bda19988ba1375272c857a
parent 8acfe468b0384e834a303f08ebc4953d72fb690a
author Nelson Elhage <nelhage@ksplice.com> 1288290667 -0700
committer David S. Miller <davem@davemloft.net> 1288291673 -0700

pktgen: Limit how much data we copy onto the stack.

A program that accidentally writes too much data to the pktgen file can overflow
the kernel stack and oops the machine. This is only triggerable by root, so
there's no security issue, but it's still an unfortunate bug.

printk() won't print more than 1024 bytes in a single call, anyways, so let's
just never copy more than that much data. We're on a fairly shallow stack, so
that should be safe even with CONFIG_4KSTACKS.

Signed-off-by: Nelson Elhage <nelhage@ksplice.com>
Signed-off-by: David S. Miller <davem@davemloft.net>